JonusNattapong/OpenThai-NER-Corpus

Thai Named Entity Recognition (NER) Corpus

A comprehensive corpus for Thai Named Entity Recognition tasks with 6,748 annotated sentences across 160 different domains.

Overview

This dataset contains Thai text samples annotated with named entity labels for training and evaluating NER models. The corpus covers a wide variety of domains including government, finance, legal, healthcare, education, and more.

Dataset Statistics

• Total Samples: 10,345 annotated sentences
• Number of Domains: 441
• Number of Domain Categories: 21 (including auto-clustered groups)
• Format: JSONL (JSON Lines)

Domain Categories by Sample Count

Category	Count	Percentage
Finance & Business	1663	16.1%
Technology & IT	1537	14.9%
Travel & Transportation	1157	11.2%
Mixed_Content	1033	10.0%
Government & Administration	808	7.8%
Healthcare & Medical	804	7.8%
Legal & Law	678	6.6%
Media & Entertainment	524	5.1%
Education & Research	498	4.8%
Regional & Minority Languages	353	3.4%
Environment & Agriculture	271	2.6%
Food & Lifestyle	252	2.4%
Telecom & Communication	194	1.9%
Real Estate & Property	186	1.8%
Energy & Infrastructure	183	1.8%
Retail & E-commerce	92	0.9%
Malay_Dialects	33	0.3%
Min_Nan_Chinese	32	0.3%
Regional_Dialects	28	0.3%
NGO	10	0.1%
Cantonese_Chinese	9	0.1%

Note: Domains are automatically categorized using keyword matching. The "Other" domains (120 total) are further clustered using TF-IDF vectorization and K-Means clustering to create more meaningful groups.

Domain Distribution Visualization

Top 10 Domain Categories by Sample Count:
Finance & Business          █████████████████ 1663 (16.1%)
Technology & IT             ████████████████  1537 (14.9%)
Travel & Transportation     ████████████     1157 (11.2%)
Mixed_Content               ███████████      1033 (10.0%)
Government & Administration ████████         808 (7.8%)
Healthcare & Medical        ████████         804 (7.8%)
Legal & Law                 ███████          678 (6.6%)
Media & Entertainment       █████            524 (5.1%)
Education & Research        █████            498 (4.8%)
Regional & Minority Languages ███             353 (3.4%)

Note: Domains are grouped into categories using keyword matching and automatic clustering. The "Other" domains are clustered using TF-IDF and K-Means into meaningful groups like Mixed_Content, Min_Nan_Chinese, Malay_Dialects, etc.

Main File: ThaiNER.jsonl

Each line contains a JSON object with the following structure:

{
  "id": "thner_0001",
  "domain": "government",
  "tokens": ["นาย", "พิพัฒพงศ์", "ทุนิจจา", "ยื่น", "คำร้อง", "ต่อ", "กรม", "การปกครอง", "..."],
  "tags": ["O", "B-PERSON", "I-PERSON", "O", "O", "O", "B-ORGANIZATION", "I-ORGANIZATION", "..."]
}

Fields

Field	Type	Description
id	string	Unique identifier (thner_XXXX format)
domain	string	Category/domain of the text
tokens	array	List of Thai words/tokens
tags	array	NER tags in BIO scheme

Named Entity Tags (BIO Scheme)

• O - Outside (not a named entity)
• B-PERSON - Beginning of person name
• I-PERSON - Inside person name
• B-ORGANIZATION - Beginning of organization
• I-ORGANIZATION - Inside organization
• B-LOCATION - Beginning of location
• I-LOCATION - Inside location
• B-DATE - Beginning of date
• I-DATE - Inside date
• B-TIME - Beginning of time
• I-TIME - Inside time
• B-MONEY - Beginning of money amount
• I-MONEY - Inside money amount
• B-ID - Beginning of ID/code
• I-ID - Inside ID/code
• B-ACCOUNT - Beginning of account number
• B-PRODUCT - Beginning of product
• B-PHONE - Beginning of phone number
• B-EMAIL - Beginning of email
• I-EMAIL - Inside email
• B-TICKER - Beginning of stock ticker

Note: Tags may include other entity types depending on the domain context.

Files in This Directory

• data/ - Data files directory
  • ThaiNER.jsonl - Main corpus file with all 10,345 annotated samples
  • ThaiNER_backup.jsonl - Backup of the original corpus
• README.md - This documentation file
• requirements.txt - Python dependencies for visualization scripts
• LICENSE.txt - License information

Analysis and Visualization

Domain Analysis Script

The repository includes a Python script (src/visualize_domains.py) for analyzing domain distributions and generating visualizations:

python src/visualize_domains.py

This script:

• Loads the JSONL data
• Categorizes domains using keyword matching
• Automatically clusters remaining "Other" domains using TF-IDF vectorization and K-Means clustering
• Generates bar and pie charts showing domain distribution
• Prints detailed statistics to console

Output Files:

• image/domain_distribution_bar.png - Bar chart of top domain categories
• image/domain_distribution_pie.png - Pie chart of domain distribution

Clustering Method:

• Domains not matching predefined categories are grouped as "Other"
• "Other" domains are clustered using TF-IDF (Term Frequency-Inverse Document Frequency) vectorization
• K-Means algorithm groups similar domains into clusters (typically 2-10 clusters based on data size)
• Clusters are assigned meaningful names based on their content:
  • Mixed_Content: Automotive, culture, religion, customer support, web, minority languages
  • Min_Nan_Chinese: Min Nan (Southern Min) Chinese dialects
  • NGO: Non-governmental organizations
  • Malay_Dialects: Malay language variants
  • Regional_Dialects: Regional dialects (Chinese, Khmer, Karen)
  • Cantonese_Chinese: Cantonese Chinese dialect

Requirements

Install dependencies:

pip install -r requirements.txt

Usage

Loading the Data

Python:

import json

# Load all samples
data = []
with open('ThaiNER.jsonl', 'r', encoding='utf-8') as f:
    for line in f:
        data.append(json.loads(line))

# Access sample
sample = data[0]
print(f"ID: {sample['id']}")
print(f"Domain: {sample['domain']}")
print(f"Tokens: {sample['tokens']}")
print(f"Tags: {sample['tags']}")

Domain Distribution Visualization

To create visual charts of domain distribution:

1. Install required packages:

pip install -r requirements.txt

2. Run the visualization script:

python src/visualize_domains.py

This will generate:

• domain_distribution_bar.png - Bar chart showing top 15 domains
• domain_distribution_pie.png - Pie chart showing top 10 domains + others
• Console output with detailed statistics

Data Domains

The corpus covers 160 different domains including:

Major Domains: Government, Finance, Legal, Travel, Education, Healthcare, Logistics, E-commerce, Technology, Retail

Other Domains: Medical, Telecom, Entertainment, Real Estate, News, Sports, Weather, IT, Energy, Food, HR, Automotive, Insurance, Business, Media, Law, Banking, Social Media, Aviation, Agriculture, Security, Transport, Politics, Customer Support, Construction, Hospitality, Manufacturing, Utilities, Gaming, Environment, Shopping, and many more...

Data Source

This corpus was generated through synthesis by:

• ChatGPT 5.2
• Gemini 3 Fast
• Gemini 3 Pro

The synthetic data was then carefully annotated with named entity labels to create a high-quality training dataset for Thai NER tasks.

Data Quality

• AI-synthesized sentences across diverse domains
• Consistent tagging across domains
• Handles multi-domain overlaps
• Supports Thai language specifics
• Includes minority languages and regional dialects of Thailand, though accuracy may vary due to limited available reference data for these languages (data for minority languages may not be 100% accurate or may be completely inaccurate)

License

This dataset is licensed under the Creative Commons Attribution 3.0 Unported (CC BY 3.0) license.

You are free to:

• Share — copy and redistribute the material in any medium or format
• Adapt — remix, transform, and build upon the material for any purpose, even commercially.

Under the following terms:

• Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.

See the full license at: https://creativecommons.org/licenses/by/3.0/

Citation

If you use this corpus in your research, please cite:

@dataset{Thainer corpus 2025,
  title={Thai Named Entity Recognition Corpus},
  author{Nattapong Tapachoom}
  year={2025},
  howpublished={https://github.com/JonusNattapong/Natural-Language-Processing}
}

Contact & Contributions

For issues, questions, or contributions, please create an issue or pull request on GitHub.

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Last Updated: December 26, 2025
Total Samples: 10,345
Total Domains: 441